/**
 * Created by qiaozhi on 16/6/30.
 */
module.exports = function () {
    function accDiv(arg1,arg2){
        var t1=0,t2=0,r1,r2;
        try{t1=arg1.toString().split(".")[1].length}catch(e){};
        try{t2=arg2.toString().split(".")[1].length}catch(e){};
        r1=Number(arg1.toString().replace(".",""));
        r2=Number(arg2.toString().replace(".",""));
        return (r1/r2)*Math.pow(10,t2-t1);
    }
    function accMul(arg1,arg2)
    {
        var m=0,s1=arg1.toString(),s2=arg2.toString();
        try{m+=s1.split(".")[1].length}catch(e){};
        try{m+=s2.split(".")[1].length}catch(e){};
        return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m);
    }
    function accAdd(arg1,arg2){
        var r1,r2,m;
        try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0};
        try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0};
        m=Math.pow(10,Math.max(r1,r2));
        return (arg1*m+arg2*m)/m;
    }
    function accSubtr(arg1,arg2){
        var r1,r2,m,n;
        try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0};
        try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0};
        m=Math.pow(10,Math.max(r1,r2));
        n=(r1>=r2)?r1:r2;
        return ((arg1*m-arg2*m)/m).toFixed(n);
    }

    Number.prototype.div = function (arg){
        return accDiv(this, arg);
    }
    Number.prototype.mul = function (arg){
        return accMul(arg, this);
    }
    Number.prototype.add = function (arg){
        return accAdd(arg,this);
    }
    Number.prototype.sub = function (arg){
        return accSubtr(arg,this);
    }
}